My daughter was older when she developed ITP, but I've been reading these boards for the past 9 years or so. Some of the parents of toddlers invest in a helmet, others pad hardwood floors with those foam puzzle mats and cover furniture corners with other foam shapes--packing materials? or cut a swim noodle to cover bars and such. A gate for the stairs, of course. At the playground, many parents follow the 'feet on the ground' rule, but right now, you likely won't have to worry so much about that as calming down rowdy uncles or the family dog. I'm sure the docs told you that your daughter's ITP is probably temporary--little ones are much more likely to remit within a year or so. Meanwhile, there is lots of info here, so read, read, read!
My own daughter was riding horses at 50K and up, so 30K is pretty much out of the danger zone. Has your daughter had any active bleeding? It gets better as you know more, but understand that we call ITP the 'roller coaster'. Both counts and your emotions! I'm sure others will chime in! Ann, Caitlin's (23) Mom